854511561 has 6 divisors (see below), whose sum is σ = 1234294490. Its totient is φ = 569674368.

The previous prime is 854511557. The next prime is 854511563. The reversal of 854511561 is 165115458.

854511561 is a `hidden beast` number, since 85 + 4 + 5 + 11 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 522579600 + 331931961 = 22860^2 + 18219^2 .

It is not a de Polignac number, because 854511561 - 2² = 854511557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (854511563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47472856 + ... + 47472873.

Almost surely, 2^854511561 is an apocalyptic number.

It is an amenable number.

854511561 is a deficient number, since it is larger than the sum of its proper divisors (379782929).

854511561 is a wasteful number, since it uses less digits than its factorization.

854511561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94945735 (or 94945732 counting only the distinct ones).

The product of its digits is 24000, while the sum is 36.

The square root of 854511561 is about 29232.0297105760. The cubic root of 854511561 is about 948.9412252356.

The spelling of 854511561 in words is "eight hundred fifty-four million, five hundred eleven thousand, five hundred sixty-one".